Elevator safety attachment



(N0 Modl.)

C.B.LABATT. ELEVATOR SAFETY ATTACHMENT.

Patented Aug. 15, 1893.

E r i M a j A t WF r r Y! 0 I 5 E N m F .l. P a X UNITED STATES A PATENT ()FFICE.

CHARLES B. LABATT, OF SAN FRANCISCO, CALIFORNIA.

ELEVATOR SAFETY ATTACH M ENT.

SPECIFICATION forming part of Letters Patent No. 503,486, dated August 15, 1893.

Application filed April 8, 1893- Serial No. 469,591. (No model.)

To. all w/wm it may concern.-

Be it known that 1, CHARLES E. LABAIT, a subject of the Queen of England, residing in the city and county of San Francisco, State of California, have invented an Improvement in Elevator Safety Attachments; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to a safety attach ment... for elevators.

It consists in certain details of construction which will be more fully explained by referenceto theaccompanyingdrawings,in which Figure 1 is a front view illustrating my device. Fig. 2 is an end view. Fig. 3 is an end view showing a modification. Fig. lis an enlarged view of one of the catches.

The object of my invention is to provide a safety attachmentfor elevators, Which remains out of action as long as the rope by which the elevator is suspended remains intact, but it will be thrown into action immediately upon the breakage of the rope, and by its action a series of safety stops is projected into the line of travel of the elevator so as to catch and hold the cage.

A A are the guide timbers upon each side of the shaft or well in which the elevator B travels.

C is the rope from which the gate is suspended and by which it is raised and depressed. This rope passes over a pulley D which is mounted upon a shaft E. This shaft extends across the full width of the elevator well and its ends are journaled in boxes F which are loosely supported in standards or frames G. The shaft also has other bearing boxes II close to the wheel D so that it is properly supported near the point Where the strain is brought upon it and it will not spring. The outer ends of the shaft may be turned down and made considerably lighter as no special strain is brought upon them. The intermediate boxes H rest upon suitable supports, as shown at I, and both these boxes H and the outer boxes F rest upon their supports without any fastening, being retained in place by the shape of their supports which are, as shown in the end View, made concave or V-shaped, forming rests in which the boxes fit snugly side motion as long as the apparatus remains intact. I

To the ends of the shaft E, or to sleeves which loosely surround the ends of the shaft, are attached ropes J which pass over pulleys K upon a shaftL, which is permanently fixed at some distance above the shaft E.

Upon the opposite ends of the ropes J, where they depend after passing over the pulleys, .are'fixed the weights M. These weights are so adjusted that while the elevator cage remains suspended by its rope, the weight of the cage is sufficient to retain the bearing boxes F and H in their supports, but if the rope C breaks so as to relieve the shaft E of the weight of the cage, the weights M will immediately lift the shaft E, with its boxes,upward, the weights descending. As those weights descend they act immediately upon the stops N which are properly supported either in the guides A or in anysnitable timbers or frame-work around the elevator Well and in close proximity with the line of travel of the cage, so that when these stops fall outward from the chamber in which they are normally concealed, they proj ectinto the path of the cage and instantly arrest it, preventing its falling a distance of more than a few feet. The stops N are constructed, as plainly shown in Fig. l, so that when they are in their normal position they lie within the chamber to which they are fitted and do not project into the line of travel of the cage. These stops are connected With the ropeJ by means of levers O which are suitably f nlcrumed with relation to each of the stops, and so connected with the rope that when the rope is moved by the action of its weight M, it will tilt the lever and throw the stop outward. The stop is so balanced that the moment the angle projects a little beyond the chamber its center of gravity is thrown outward, and the stop will fall by its own weight into the line of travel of the elevator cage, and will immediately arrest the latter.

In Fig. 3. I have shown the rope J extending down below the shaft E, and the levers which operate the stops are connected with this portion of the rope.

In Fig. 2. I have shown the levers connected and by which they are prevented from any with that portion of the rope between the pulley and the weight, the operation being essentially the same in either case.

Iiaving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. An elevator safety attachment consisting of movable stops held normally out of the line of travel of the elevator cage, an elevator cage moving in a vertical wall, a shaft loosely mounted in hearings to move upward, a pulley fixed to said shaft, a suspending-and-hoisting rope secured to said cage and supported by said pulley, ropes connected to'the ends of said shaft and passing over pulleys above it and having Weights upon their depending ends, said ropes being connected with the stops so as to throw them outward in theline of travel of the elevator when the ropes are moved by the weights, substantially as herein described.

2. An elevator cage moving in a vertical well, a suspending-and-hoisting rope passing over a pulley above the line of travel of the cage, a shaft, the journal boxes of which rest loosely in open topped supports and normally retained therein by the Weight of the elevator cage, ropes connected with the outer ends of said shaft, passing over pulleys above it, and having weights upon their outer depending ends, which weights are less than that of the elevator cage, gravity stops contained in chambers situated along the line of travel of the elevator cage, lever arms connecting the ropes of the suspended weights with said stops, whereby a breakage of the cage suspending rope allows the supplemental weights to move the ropes to which they are attached and throw the stops outward into the line of travel of the cage, substantially as herein described.

In witness whereof I have hereunto set my hand.

CHARLES E. LABATT.

Witnesses:

S, H. NOURSE, J. ABAYLESS. 

